package com.hmdp.service.impl;

import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.mapper.ShopMapper;
import com.hmdp.service.IShopService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.CacheClient;
import com.hmdp.utils.RedisData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;

import java.time.LocalDateTime;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopServiceImpl extends ServiceImpl<ShopMapper, Shop> implements IShopService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
   private CacheClient cacheClient;
    @Override
    public Result quetById(Long id) {
        //缓存穿透
//        Shop shop = cacheClient.queryWithPassThrough(CACHE_SHOP_KEY,id,Shop.class,this::getById,CACHE_SHOP_TTL,TimeUnit.MINUTES);
        //互斥锁解决缓存击穿
//        Shop shop = queryWithMutex(id);

        //逻辑过期解决缓存击穿
        Shop shop = cacheClient.queryWithLogicalExpire(CACHE_SHOP_KEY,id,Shop.class,this::getById,CACHE_SHOP_TTL,TimeUnit.MINUTES);

        if (shop == null){
            return Result.fail("店铺不存在");
        }
        return Result.ok(shop);
    }
    //线程池


//    public Shop queryWithMutex(Long id){
//        //1.从redis根据id查数据
//        String shopJson = stringRedisTemplate.opsForValue().get(CACHE_SHOP_KEY + id);
//        //2.判断是否存在
//        if (StrUtil.isNotBlank(shopJson)) {
//            Shop shop = JSONUtil.toBean(shopJson, Shop.class);
//            //3.若存在直接返回数据
//            return shop;
//        }
//        //判断是否命中空值
//        if (shopJson != null){
//            //返回错误信息
//            return null;
//        }
//        //4。实现缓存重建
//        //4.1获取互斥锁
//        Shop shop = null;
//        try {
//            boolean isLock = tryLock(LOCK_SHOP_KEY);
//            //4.2 判断是否成功
//            if (!isLock){
//                //4.3失败，则休眠并重试
//                Thread.sleep(50);
//                return queryWithMutex(id);
//            }
//            //4.4成功，根据id查询数据库
//            shop = getById(id);
//            //模拟延迟
//            Thread.sleep(200);
//            //5.若不存在，返回错误信息
//            if (shop == null){
//                //将空值写入redis
//                stringRedisTemplate.opsForValue().set(CACHE_SHOP_KEY + id,"",CACHE_NULL_TTL,TimeUnit.MINUTES);
//                return null;
//            }
//            //6.将数据写入redis
//            stringRedisTemplate.opsForValue().set(CACHE_SHOP_KEY + id,JSONUtil.toJsonStr(shop));
//            stringRedisTemplate.expire(CACHE_SHOP_KEY + id,30, TimeUnit.MINUTES);
//
//        } catch (InterruptedException e) {
//            throw new RuntimeException(e);
//        }finally {
//            //7.释放互斥锁
//            unlock(LOCK_SHOP_KEY);
//        }
//
//        //8.返回数据
//        return shop;
//    }
    //缓存穿透
//    public Shop queryWithPassThrough(Long id){
//        //1.从redis根据id查数据
//        String shopJson = stringRedisTemplate.opsForValue().get(CACHE_SHOP_KEY + id);
//        //2.判断是否存在
//        if (StrUtil.isNotBlank(shopJson)) {
//            Shop shop = JSONUtil.toBean(shopJson, Shop.class);
//            //3.若存在直接返回数据
//            return shop;
//        }
//        //判断是否命中空值
//        if (shopJson != null){
//            //返回错误信息
//            return null;
//        }
//        //4.从数据库中根据id查数据
//        Shop shop = getById(id);
//        //5.若不存在，返回错误信息
//        if (shop == null){
//            //将空值写入redis
//            stringRedisTemplate.opsForValue().set(CACHE_SHOP_KEY + id,"",CACHE_NULL_TTL,TimeUnit.MINUTES);
//            return null;
//        }
//        //6.将数据写入redis
//        stringRedisTemplate.opsForValue().set(CACHE_SHOP_KEY + id,JSONUtil.toJsonStr(shop));
//        stringRedisTemplate.expire(CACHE_SHOP_KEY + id,30, TimeUnit.MINUTES);
//        //7.返回数据
//        return shop;
//    }


    public void  saveShop2Redis(Long id,Long expireSeconds) throws InterruptedException {
        //1.查询店铺数据
        Shop shop = getById(id);
        Thread.sleep(200);
        //2.封装逻辑过期时间
        RedisData redisData = new RedisData();
        redisData.setData(shop);
        redisData.setExpireTime(LocalDateTime.now().plusSeconds(expireSeconds));
        //3.写入redis
        stringRedisTemplate.opsForValue().set(CACHE_SHOP_KEY + id,JSONUtil.toJsonStr(redisData));
    }
    @Override
    @Transactional
    public Result update(Shop shop) {
        Long id = shop.getId();
        if (id == null){
            return Result.fail("店铺id不等于空");
        }
        //先更新数据库然后在删除缓存
        updateById(shop);
        stringRedisTemplate.delete(CACHE_SHOP_KEY + id);
        return null;
    }
}
